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109a8b9058
The build could have exhibited inconsistent behavior or simply failed if there was another "perl" program already in path - either because it was too old or too new, from some broken installation, or just a batch file instead of a plain executable (which would require changing OpenSSL's scripts to do "call perl x.pl" instead of just "perl x.pl"). This change resolves the ambiguity by putting the downloaded Perl first in path, so that the same working version is used on all systems.